BirdAnalyst
BBS Route · New Hampshire · BCR 30

Brentwood Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 116 species recorded across 33 survey years, no longer active.

116Species RecordedSpecies recordedDistinct species detected on standard-protocol BBS runs here across all years on record — a measure of survey breadth, not a complete checklist.Full methodology →
33Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–1998Span
5Observers

Bird Species Found on New Hampshire Brentwood

Top 40 of 116 species by most recent count. Each links to its species trend.

Species recorded on the Brentwood route.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →Baseline yearThe first year of the smoothed window the trend is measured from. An earlier baseline means a longer record stands behind the number.Full methodology →History
American CrowCorvidae341998+48%1968
Gray CatbirdMimidae271998-25%1968
American RobinTurdidae241998-50%1968
Chipping SparrowPasserellidae231998+16%1968
Mourning DoveColumbidae201998+114%1968
OvenbirdParulidae201998+7%1968
American GoldfinchFringillidae191998+71%1968
House SparrowPasseridae191998-44%1968
European StarlingSturnidae181998-79%1968
Common YellowthroatParulidae181998-31%1968
House FinchFringillidae171998+400%1984
Wood ThrushTurdidae161998-39%1968
Northern CardinalCardinalidae151998+867%1978
Cedar WaxwingBombycillidae141998+211%1968
Black-capped ChickadeeParidae131998+38%1968
Eastern PhoebeTyrannidae111998+24%1968
Blue JayCorvidae111998-63%1968
Red-winged BlackbirdIcteridae111998-36%1968
Song SparrowPasserellidae111998-57%1968
Tree SwallowHirundinidae111997+16%1968
Tufted TitmouseParidae11199814×1978
Pine WarblerParulidae101998+467%1982
Northern MockingbirdMimidae91998+150%1974
Eastern KingbirdTyrannidae81998+30%1968
Red-eyed VireoVireonidae81998-66%1968
White-breasted NuthatchSittidae81998+167%1968
Eastern Wood-PeweeTyrannidae71998-5%1968
Scarlet TanagerCardinalidae71998+16%1968
Black-and-white WarblerParulidae61998+150%1968
Eastern TowheePasserellidae51998-91%1968
Downy WoodpeckerPicidae41998-40%1968
BobolinkIcteridae41998+35%1968
Brown-headed CowbirdIcteridae41998-41%1968
Common GrackleIcteridae41998-83%1968
Yellow WarblerParulidae41998+24%1968
Warbling VireoVireonidae31998-20%1968
Ruffed GrousePhasianidae31967n/an/a
Great Black-backed GullLaridae31983-25%1968
Great Blue HeronArdeidae31997+25%1972
Barred OwlStrigidae31971n/an/a

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.